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  1. Replies
    10$$
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    1,273

    It does seem hot, but don't jump to conclusions...

    It does seem hot, but don't jump to conclusions about the breakers themselves. That heat could easily be getting transferred along the bus or conductors from another hot spot, such as the lugs for...
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    214$$
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    3,938

    That doesn't mean it hasn't given me useful...

    That doesn't mean it hasn't given me useful information.

    I'd like to get back to which brands produce multi-pole breakers that won't trip on certain systems.

    No one makes a 3-pole AFCI, right?...
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    2$$
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    94

    Thanks.

    Thanks.
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    7$$
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    318

    Not if the rod is listed.

    Not if the rod is listed.
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    214$$
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    Folks, overcurrent was and is irrelevant to the...

    Folks, overcurrent was and is irrelevant to the topic.
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    2$$
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    94

    Load calc 208/230V A/C on 240V system?

    If an air-conditioning unit has a label which says "208/230-1-60" and it's installed on a 240V system would you make adjustments for the load amps for load calculations?

    We're talking afaik a...
  7. Replies
    214$$
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    So was 'single-phase' put into the code language...

    So was 'single-phase' put into the code language purposefully to exempt MWBCs wired to a 3-phase system? It seems like it. I'm wondering if anyone knows who can confirm.
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    214$$
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    Wouldn't I need a 3-pole AFCI for the 4-wire, and...

    Wouldn't I need a 3-pole AFCI for the 4-wire, and doesn't that not exist?
  9. Replies
    214$$
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    Sorry, I meant to add all these emojis to my last...

    Sorry, I meant to add all these emojis to my last post:

    :lol::happyno::slaphead::p:D:bye:

    Seriously though, those past discussions prove that the phrase 'single-phase' has no enforceable...
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    214$$
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    Is this thread about to die? We haven't even...

    Is this thread about to die? We haven't even discussed yet why 210.12 says 'single phase'?
  11. Replies
    214$$
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    My point would be that the the language of 210.12...

    My point would be that the the language of 210.12 is at the least ambiguous and confusing with respect to whether MWBCs require AFCI protection. Wayne seems to have taken up my point.
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    214$$
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    A 'voltage class' is the voltages in a...

    A 'voltage class' is the voltages in a multi-voltage system! It gives examples right there in Article 100! ;)



    (Emphasis added.)
  13. Replies
    214$$
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    (I thought I posted something like this...

    (I thought I posted something like this yesterday, but apparently it didn't upload...)

    david luchini has given the most robust answer to my original question. The MWBC is a 240V circuit per...
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    214$$
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    You've stated this three times without citing any...

    You've stated this three times without citing any code section to back it up. I think it's wrong. Clearly 125V receptacles may be installed on a 120/240V multiwire branch circuit. Article 100...
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    214$$
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    It's not that it's hard to understand your point...

    It's not that it's hard to understand your point of view. And if that is the industry consensus (more or less) then I'm not going to fight it. It's just that I don't think it's at all obvious from...
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    214$$
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    [QUOTE=jap;2003244]AFCI requirement was never...

    I don't really want to go down this irrelevant tangent, but the point is that you cannot say that two separate breakers allow the user to simultaneously disconnect. The installation has to be such...
  17. Replies
    214$$
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    Actually, you quite clear said the converse: an...

    Actually, you quite clear said the converse: an MWBC is not a 120-volt circuit. Which in the context of my question would definitely mean that the arc fault requirement doesn't apply. But it seems...
  18. Thread: Mystery Ufer

    by jaggedben
    Replies
    8$$
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    317

    Around here at least some cities require a ufer...

    Around here at least some cities require a ufer to be installed if there isn't one already and a certain amount of new footing is built. Just connect it to the existing service.
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    38$$
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    One major city on the west coast has a local...

    One major city on the west coast has a local ammendment that changes the high leg from orange to purple.
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    214$$
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    Darn, maybe I should give up. Forget the...

    Darn, maybe I should give up.

    Forget the logic and arguments. Anyone else want to help me out with their AHJ experience on AFCIs? I've got jap saying all the AHJs agree with him. Others...
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    214$$
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    No, no, no, I will not have this thread become...

    No, no, no, I will not have this thread become another debate about whether 120/240 is one or two phases. All other posters are directed to not respond to this argument. :happyno::lol::slaphead:
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    214$$
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    Have you been able to argue this successfully...

    Have you been able to argue this successfully with an AHJ?
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    214$$
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    I don't see a substantive physical difference...

    I don't see a substantive physical difference between an MWBC and, say, a 240V outlet with neutral.

    I admit that this is a 'letter' vs. 'spirit' kind of a thing. It certainly seems like the...
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    214$$
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    AFCI required on MWBC?

    I searched through past threads but I didn't find anything that addressed the question directly to my satisfaction.

    The code requires arc fault protection on "120-volt, single-phase, 15- and...
  25. Replies
    3$$
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    261

    Yup.

    Yup.
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